Now I hear that veteran showrunner Shiban has informed the network that he wont be coming back after two years on the show. As a result, I hear Hell On Wheels pickup has been put on hold until a new showrunner is found.

AMC's western drama "Hell on Wheels" will be back for a third season, and it will roll onto the air with a new showrunner, the network said Wednesday.

John Wirth, whose credits include "V," "Falling Skies" and "Terminator: The Sarah Connor Chronicles," is stepping in as executive producer and showunner for the series, replacing departed showrunner John Shiban, who left the show in November. Shiban's exit held up the third-season renewal of the series,